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<title>Qt 4.6: QStatusBar Class Reference</title>
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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QStatusBar Class Reference<br /><span class="small-subtitle">[<a href="qtgui.html">QtGui</a> module]</span>
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<p>The QStatusBar class provides a horizontal bar suitable for presenting status information. <a href="#details">More...</a></p>
<pre> #include <QStatusBar></pre><p>Inherits <a href="qwidget.html">QWidget</a>.</p>
<ul>
<li><a href="qstatusbar-members.html">List of all members, including inherited members</a></li>
<li><a href="qstatusbar-qt3.html">Qt 3 support members</a></li>
</ul>
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<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li><div class="fn"><b><a href="qstatusbar.html#sizeGripEnabled-prop">sizeGripEnabled</a></b> : bool</div></li>
</ul>
<ul>
<li><div bar="2" class="fn"></div>58 properties inherited from <a href="qwidget.html#properties">QWidget</a></li>
<li><div bar="2" class="fn"></div>1 property inherited from <a href="qobject.html#properties">QObject</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#QStatusBar">QStatusBar</a></b> ( QWidget * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#dtor.QStatusBar">~QStatusBar</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a></b> ( QWidget * <i>widget</i>, int <i>stretch</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#addWidget">addWidget</a></b> ( QWidget * <i>widget</i>, int <i>stretch</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QString </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#currentMessage">currentMessage</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#insertPermanentWidget">insertPermanentWidget</a></b> ( int <i>index</i>, QWidget * <i>widget</i>, int <i>stretch</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#insertWidget">insertWidget</a></b> ( int <i>index</i>, QWidget * <i>widget</i>, int <i>stretch</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#sizeGripEnabled-prop">isSizeGripEnabled</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#removeWidget">removeWidget</a></b> ( QWidget * <i>widget</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#sizeGripEnabled-prop">setSizeGripEnabled</a></b> ( bool )</td></tr>
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<li><div bar="2" class="fn"></div>217 public functions inherited from <a href="qwidget.html#public-functions">QWidget</a></li>
<li><div bar="2" class="fn"></div>29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
<li><div bar="2" class="fn"></div>13 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li>
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<a name="public-slots"></a>
<h2>Public Slots</h2>
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<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#clearMessage">clearMessage</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#showMessage">showMessage</a></b> ( const QString & <i>message</i>, int <i>timeout</i> = 0 )</td></tr>
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<ul>
<li><div bar="2" class="fn"></div>19 public slots inherited from <a href="qwidget.html#public-slots">QWidget</a></li>
<li><div bar="2" class="fn"></div>1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
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<a name="signals"></a>
<h2>Signals</h2>
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<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#messageChanged">messageChanged</a></b> ( const QString & <i>message</i> )</td></tr>
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<li><div bar="2" class="fn"></div>1 signal inherited from <a href="qwidget.html#signals">QWidget</a></li>
<li><div bar="2" class="fn"></div>1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
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<a name="protected-functions"></a>
<h2>Protected Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#hideOrShow">hideOrShow</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#reformat">reformat</a></b> ()</td></tr>
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<a name="reimplemented-protected-functions"></a>
<h2>Reimplemented Protected Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#event">event</a></b> ( QEvent * <i>e</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#paintEvent">paintEvent</a></b> ( QPaintEvent * <i>event</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#resizeEvent">resizeEvent</a></b> ( QResizeEvent * <i>e</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><b><a href="qstatusbar.html#showEvent">showEvent</a></b> ( QShowEvent * )</td></tr>
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<li><div bar="2" class="fn"></div>37 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li><div bar="2" class="fn"></div>7 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li><div bar="2" class="fn"></div>1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li>
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<h3>Additional Inherited Members</h3>
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<li><div class="fn"></div>4 static public members inherited from <a href="qwidget.html#static-public-members">QWidget</a></li>
<li><div class="fn"></div>5 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li><div class="fn"></div>1 protected slot inherited from <a href="qwidget.html#protected-slots">QWidget</a></li>
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<a name="details"></a>
<hr />
<h2>Detailed Description</h2>
<p>The QStatusBar class provides a horizontal bar suitable for presenting status information.</p>
<p>Each status indicator falls into one of three categories:</p>
<ul>
<li><i>Temporary</i> - briefly occupies most of the status bar. Used to explain tool tip texts or menu entries, for example.</li>
<li><i>Normal</i> - occupies part of the status bar and may be hidden by temporary messages. Used to display the page and line number in a word processor, for example.</li>
<li><i>Permanent</i> - is never hidden. Used for important mode indications, for example, some applications put a Caps Lock indicator in the status bar.</li>
</ul>
<p>QStatusBar lets you display all three types of indicators.</p>
<p>Typically, a request for the status bar functionality occurs in relation to a <a href="qmainwindow.html">QMainWindow</a> object. <a href="qmainwindow.html">QMainWindow</a> provides a main application window, with a menu bar, tool bars, dock widgets <i>and</i> a status bar around a large central widget. The status bar can be retrieved using the <a href="qmainwindow.html#statusBar">QMainWindow::statusBar</a>() function, and replaced using the <a href="qmainwindow.html#setStatusBar">QMainWindow::setStatusBar</a>() function.</p>
<p>Use the <a href="qstatusbar.html#showMessage">showMessage</a>() slot to display a <i>temporary</i> message:</p>
<pre> void MainWindow::createStatusBar()
{
statusBar()->showMessage(tr("Ready"));
}</pre>
<p>To remove a temporary message, use the <a href="qstatusbar.html#clearMessage">clearMessage</a>() slot, or set a time limit when calling <a href="qstatusbar.html#showMessage">showMessage</a>(). For example:</p>
<pre> void MainWindow::print()
{
#ifndef QT_NO_PRINTDIALOG
QTextDocument *document = textEdit->document();
QPrinter printer;
QPrintDialog *dlg = new QPrintDialog(&printer, this);
if (dlg->exec() != QDialog::Accepted)
return;
document->print(&printer);
statusBar()->showMessage(tr("Ready"), 2000);
#endif
}</pre>
<p>Use the <a href="qstatusbar.html#currentMessage">currentMessage</a>() function to retrieve the temporary message currently shown. The QStatusBar class also provide the <a href="qstatusbar.html#messageChanged">messageChanged</a>() signal which is emitted whenever the temporary status message changes.</p>
<a name="permanent-message"></a><p><i>Normal</i> and <i>Permanent</i> messages are displayed by creating a small widget (<a href="qlabel.html">QLabel</a>, <a href="qprogressbar.html">QProgressBar</a> or even <a href="qtoolbutton.html">QToolButton</a>) and then adding it to the status bar using the <a href="qstatusbar.html#addWidget">addWidget</a>() or the <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>() function. Use the <a href="qstatusbar.html#removeWidget">removeWidget</a>() function to remove such messages from the status bar.</p>
<pre> statusBar()->addWidget(new MyReadWriteIndication);</pre>
<p>By default QStatusBar provides a <a href="qsizegrip.html">QSizeGrip</a> in the lower-right corner. You can disable it using the <a href="qstatusbar.html#sizeGripEnabled-prop">setSizeGripEnabled</a>() function. Use the <a href="qstatusbar.html#sizeGripEnabled-prop">isSizeGripEnabled</a>() function to determine the current status of the size grip.</p>
<p align="center"><img src="images/plastique-statusbar.png" alt="A status bar shown in the Plastique widget style" /></p><p>See also <a href="qmainwindow.html">QMainWindow</a>, <a href="qstatustipevent.html">QStatusTipEvent</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Status Bar</a>, and <a href="mainwindows-application.html">Application Example</a>.</p>
<hr />
<h2>Property Documentation</h2>
<a name="//apple_ref/cpp/instm/QStatusBar/isSizeGripEnabled"></a>
<a name="//apple_ref/cpp/instm/QStatusBar/setSizeGripEnabled"></a>
<h3 class="fn"><a name="sizeGripEnabled-prop"></a>sizeGripEnabled : bool</h3>
<p>This property holds whether the QSizeGrip in the bottom-right corner of the status bar is enabled.</p>
<p>The size grip is enabled by default.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary" border="0" cellpadding="0" cellspacing="0" width="100%">
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b>isSizeGripEnabled</b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b>setSizeGripEnabled</b> ( bool )</td></tr>
</table>
<hr />
<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QStatusBar/QStatusBar"></a>
<h3 class="fn"><a name="QStatusBar"></a>QStatusBar::QStatusBar ( <a href="qwidget.html">QWidget</a> * <i>parent</i> = 0 )</h3>
<p>Constructs a status bar with a size grip and the given <i>parent</i>.</p>
<p>See also <a href="qstatusbar.html#sizeGripEnabled-prop">setSizeGripEnabled</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/~QStatusBar"></a>
<h3 class="fn"><a name="dtor.QStatusBar"></a>QStatusBar::~QStatusBar () <tt> [virtual]</tt></h3>
<p>Destroys this status bar and frees any allocated resources and child widgets.</p>
<a name="//apple_ref/cpp/instm/QStatusBar/addPermanentWidget"></a>
<h3 class="fn"><a name="addPermanentWidget"></a>void QStatusBar::addPermanentWidget ( <a href="qwidget.html">QWidget</a> * <i>widget</i>, int <i>stretch</i> = 0 )</h3>
<p>Adds the given <i>widget</i> permanently to this status bar, reparenting the widget if it isn't already a child of this <a href="qstatusbar.html">QStatusBar</a> object. The <i>stretch</i> parameter is used to compute a suitable size for the given <i>widget</i> as the status bar grows and shrinks. The default stretch factor is 0, i.e giving the widget a minimum of space.</p>
<p>Permanently means that the widget may not be obscured by temporary messages. It is is located at the far right of the status bar.</p>
<p>See also <a href="qstatusbar.html#insertPermanentWidget">insertPermanentWidget</a>(), <a href="qstatusbar.html#removeWidget">removeWidget</a>(), and <a href="qstatusbar.html#addWidget">addWidget</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/addWidget"></a>
<h3 class="fn"><a name="addWidget"></a>void QStatusBar::addWidget ( <a href="qwidget.html">QWidget</a> * <i>widget</i>, int <i>stretch</i> = 0 )</h3>
<p>Adds the given <i>widget</i> to this status bar, reparenting the widget if it isn't already a child of this <a href="qstatusbar.html">QStatusBar</a> object. The <i>stretch</i> parameter is used to compute a suitable size for the given <i>widget</i> as the status bar grows and shrinks. The default stretch factor is 0, i.e giving the widget a minimum of space.</p>
<p>The widget is located to the far left of the first permanent widget (see <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>()) and may be obscured by temporary messages.</p>
<p>See also <a href="qstatusbar.html#insertWidget">insertWidget</a>(), <a href="qstatusbar.html#removeWidget">removeWidget</a>(), and <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/clearMessage"></a>
<h3 class="fn"><a name="clearMessage"></a>void QStatusBar::clearMessage () <tt> [slot]</tt></h3>
<p>Removes any temporary message being shown.</p>
<p>See also <a href="qstatusbar.html#currentMessage">currentMessage</a>(), <a href="qstatusbar.html#showMessage">showMessage</a>(), and <a href="qstatusbar.html#removeWidget">removeWidget</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/currentMessage"></a>
<h3 class="fn"><a name="currentMessage"></a><a href="qstring.html">QString</a> QStatusBar::currentMessage () const</h3>
<p>Returns the temporary message currently shown, or an empty string if there is no such message.</p>
<p>See also <a href="qstatusbar.html#showMessage">showMessage</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/event"></a>
<h3 class="fn"><a name="event"></a>bool QStatusBar::event ( <a href="qevent.html">QEvent</a> * <i>e</i> ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qobject.html#event">QObject::event</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/hideOrShow"></a>
<h3 class="fn"><a name="hideOrShow"></a>void QStatusBar::hideOrShow () <tt> [protected]</tt></h3>
<p>Ensures that the right widgets are visible.</p>
<p>Used by the <a href="qstatusbar.html#showMessage">showMessage</a>() and <a href="qstatusbar.html#clearMessage">clearMessage</a>() functions.</p>
<a name="//apple_ref/cpp/instm/QStatusBar/insertPermanentWidget"></a>
<h3 class="fn"><a name="insertPermanentWidget"></a>int QStatusBar::insertPermanentWidget ( int <i>index</i>, <a href="qwidget.html">QWidget</a> * <i>widget</i>, int <i>stretch</i> = 0 )</h3>
<p>Inserts the given <i>widget</i> at the given <i>index</i> permanently to this status bar, reparenting the widget if it isn't already a child of this <a href="qstatusbar.html">QStatusBar</a> object. If <i>index</i> is out of range, the widget is appended (in which case it is the actual index of the widget that is returned).</p>
<p>The <i>stretch</i> parameter is used to compute a suitable size for the given <i>widget</i> as the status bar grows and shrinks. The default stretch factor is 0, i.e giving the widget a minimum of space.</p>
<p>Permanently means that the widget may not be obscured by temporary messages. It is is located at the far right of the status bar.</p>
<p>This function was introduced in Qt 4.2.</p>
<p>See also <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>(), <a href="qstatusbar.html#removeWidget">removeWidget</a>(), and <a href="qstatusbar.html#addWidget">addWidget</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/insertWidget"></a>
<h3 class="fn"><a name="insertWidget"></a>int QStatusBar::insertWidget ( int <i>index</i>, <a href="qwidget.html">QWidget</a> * <i>widget</i>, int <i>stretch</i> = 0 )</h3>
<p>Inserts the given <i>widget</i> at the given <i>index</i> to this status bar, reparenting the widget if it isn't already a child of this <a href="qstatusbar.html">QStatusBar</a> object. If <i>index</i> is out of range, the widget is appended (in which case it is the actual index of the widget that is returned).</p>
<p>The <i>stretch</i> parameter is used to compute a suitable size for the given <i>widget</i> as the status bar grows and shrinks. The default stretch factor is 0, i.e giving the widget a minimum of space.</p>
<p>The widget is located to the far left of the first permanent widget (see <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>()) and may be obscured by temporary messages.</p>
<p>This function was introduced in Qt 4.2.</p>
<p>See also <a href="qstatusbar.html#addWidget">addWidget</a>(), <a href="qstatusbar.html#removeWidget">removeWidget</a>(), and <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/messageChanged"></a>
<h3 class="fn"><a name="messageChanged"></a>void QStatusBar::messageChanged ( const <a href="qstring.html">QString</a> & <i>message</i> ) <tt> [signal]</tt></h3>
<p>This signal is emitted whenever the temporary status message changes. The new temporary message is passed in the <i>message</i> parameter which is a null-string when the message has been removed.</p>
<p>See also <a href="qstatusbar.html#showMessage">showMessage</a>() and <a href="qstatusbar.html#clearMessage">clearMessage</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/paintEvent"></a>
<h3 class="fn"><a name="paintEvent"></a>void QStatusBar::paintEvent ( <a href="qpaintevent.html">QPaintEvent</a> * <i>event</i> ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>
<p>Shows the temporary message, if appropriate, in response to the paint <i>event</i>.</p>
<a name="//apple_ref/cpp/instm/QStatusBar/reformat"></a>
<h3 class="fn"><a name="reformat"></a>void QStatusBar::reformat () <tt> [protected]</tt></h3>
<p>Changes the status bar's appearance to account for item changes.</p>
<p>Special subclasses may need this function, but geometry management will usually take care of any necessary rearrangements.</p>
<a name="//apple_ref/cpp/instm/QStatusBar/removeWidget"></a>
<h3 class="fn"><a name="removeWidget"></a>void QStatusBar::removeWidget ( <a href="qwidget.html">QWidget</a> * <i>widget</i> )</h3>
<p>Removes the specified <i>widget</i> from the status bar.</p>
<p><b>Note:</b> This function does not delete the widget but <i>hides</i> it. To add the widget again, you must call both the <a href="qstatusbar.html#addWidget">addWidget</a>() and <a href="qwidget.html#show">show</a>() functions.</p>
<p>See also <a href="qstatusbar.html#addWidget">addWidget</a>(), <a href="qstatusbar.html#addPermanentWidget">addPermanentWidget</a>(), and <a href="qstatusbar.html#clearMessage">clearMessage</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/resizeEvent"></a>
<h3 class="fn"><a name="resizeEvent"></a>void QStatusBar::resizeEvent ( <a href="qresizeevent.html">QResizeEvent</a> * <i>e</i> ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#resizeEvent">QWidget::resizeEvent</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/showEvent"></a>
<h3 class="fn"><a name="showEvent"></a>void QStatusBar::showEvent ( <a href="qshowevent.html">QShowEvent</a> * ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#showEvent">QWidget::showEvent</a>().</p>
<a name="//apple_ref/cpp/instm/QStatusBar/showMessage"></a>
<h3 class="fn"><a name="showMessage"></a>void QStatusBar::showMessage ( const <a href="qstring.html">QString</a> & <i>message</i>, int <i>timeout</i> = 0 ) <tt> [slot]</tt></h3>
<p>Hides the normal status indications and displays the given <i>message</i> for the specified number of milli-seconds (<i>timeout</i>). If <i>timeout</i> is 0 (default), the <i>message</i> remains displayed until the <a href="qstatusbar.html#clearMessage">clearMessage</a>() slot is called or until the showMessage() slot is called again to change the message.</p>
<p>Note that showMessage() is called to show temporary explanations of tool tip texts, so passing a <i>timeout</i> of 0 is not sufficient to display a <a href="qstatusbar.html#permanent-message">permanent message</a>.</p>
<p>See also <a href="qstatusbar.html#messageChanged">messageChanged</a>(), <a href="qstatusbar.html#currentMessage">currentMessage</a>(), and <a href="qstatusbar.html#clearMessage">clearMessage</a>().</p>
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<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
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